Combined shaker screen and conveyer



March 6, 1928. 1,661,781

J. B. WHITNALL COMBINED SHAKER SCREEN AND CONVEYER I r Filed Nov. 5;1924 Jssafi v ii/24M.

Patented Mar. 6, 1928.

UNITED STATES PATENT OFFICE- JESSE B. WHITNALL, OF MILWAUKEE, WISCONSIN,ASSIGNOR T NORTHIELRYN' GON- VEYOR & MFG. (10., OF MILWAUKEE, WISCONSIN,A CORPORATION OF WISCONSIN.

COMBINED SHAKER SCREEN QA'NID CONVEYER.

Application filed November 3, 1924. Serial No. 747,533.

This invention relates to improvements in combined shaker screens andconveyers, more particularly adapted for screening sand, gravel, coaland other like material.

It is one of the objects of the present invention to combine a shakerscreen with a portable conveyor in such a manner as to provide for theconveyor carrying the material. upwardly to the conveyor screen and thescreened material be discharged directly into a vehicle for furtherdisposition.

A further object of the invention is to provide a combined shaker screenand conveyor in which the screening member is oscillated directly fromone of the conveyor shafts.

A further object of the invention is to provide a combined shaker screenand conreyer in which one, two or three screens may be used in screeningmaterial. 1

A further object of the invention is to provide a combined shaker screenwhich may be easily mounted upon and form part of an ordinary portablecon'veyer in a very simple manner.

A. further object of the invention is to provide a combined shakerscreen and conveyer which is of very simple construction, is strong anddurable and is well adapted for the purpose described.

With the above other objects in view, the

invention consists of the improved combined shaker screen and conveyorand its parts and combinations as set forth in the claims and allequivalents thereof.

In the accompanying drawing, in which the same reference charactersindicate the san'ie parts in all of the views:

Fig. 1 is a side view of the improved shaker screen shown mounted on aportable conveyor; and

Fig. 2 is a transverse sectional view thereof.

Referring to the drawing, the numeral 5 indicates a conveyer, preferablyof the portable type, which is provided with an endless belt 6, havingspaced slat-s 7 for conveying material such as sand, gravel or othermaterial from a lower to a higher,

plane of discharge.

The improved shaker screen is mounted on the conveyer and comprises inpart L-shaped. frames 8 bolted on the upper opposite sides of theconveyor and to which frames a relatively fixed screen frame 9 and anoscillatory v tom screen portion 14 for screening the finer particlesfrom the coarser. The said upper screen 18 of greater length than theoscillatory screen and at its inner end is connected to the L-shapedframeby pivots or hinges 15 to permit adjusting the angle of the screen.To provide for said adjustment, the lower-ends of the brace members 11are connected to medial portions of the screen frame by pivot pins 16,and-at their upperends said members are provided with bolt holes 17 foradjustably receiving bolts 18.

The lower oroscillatory screen is provided with side boards or members19 spaced a greater distance apart than'the side members of the "upperscreen and adj ustably connected thereto by straps 20.which are mountedon the pins 16 and depends downwardly therefrom. Bolts 21 connect themembers 19 to the straps and may be inserted in any of the bolt holes22. and23 formed in said parts. The inner ends of the side members 19are pivotally connected to the shaftQt. The frame 24 proper of the lowerscreen 25 is swingingly suspended from the side members 19 by links26,and is free to swing or oscillate lengthwise as indicated. The shaft 24atits opposite ends is provided with sprocket wheels 27 whichhave asprocket chain connection 28 with a driving means of the conveyerandsaidshaft is also projournaled at one end to the wrist pins are journaled attheir opposite ends to the screen frame 24 by projecting pins 32, asclearly shown. 1

Both screens are connected to the conveyor frame at points beneath theplane of the upper end portion of the endless belt or conveyer 6, sothat the material discharged therefrom will drop onto the upper inclinedscreen, and in its travel down said screen the finer particles will fallthrough the screen and onto the finer screen below to be again screenedby the oscillatory screen. Said last mentioned screen will discharge thecoarser particles from the outer end of the screen while the finerparticles will pass therethrough.

It is to be understood that one, two, three or any number of screens maybe used as desired, without departing from the spirit of the invention.

To prevent lateral movement of the 0s cillatory screen member, guidemembers 33 connected to the outer sides of the lower side members extenddownwardly on opposite sides of the oscillatory screen and beneath thescreen, thus confining the movement of the screen within the confines ofsaid guide members, as shown.

The lower screen is of less length than the upper screen, so that. thecoarser material carried by the upper screen may be discharged at apoint different from the point of discharge of the lower screen. As thescreens extend in a plane above the height of a truck, the screenedmaterial may be directly discharged into a truck.

In use, the shaker screen connected to the conveyor framein the mannershown and described, and the angle of the screens adjusted as described.Upon transmitting motion to the wrist pin wheels, the lower screen willbe oscillated back and forth and completely screen the material fedthereto from the conveyor belt.

From the foregoing description it will be seen that the combined shakerscreen and conveyor is of very simple construction and is well adaptedfor the purpose described.

\VhatI claim as my invention is:

1. The combination with a conveyor for elevating material, of a shakerscreen therefor, comprising a frame attachable to the conveyor andhaving members connected to and projecting outwardly therefrom, a

longitudinally extending fixed screen connected to some of the membersand projecting outwardly therefrom, longitudinally extending side boardsconnected to the fixed screen and some of the frame members, said sideboards being spaced apart a distance greater than the width of the fixedscreen, a longitudinally extending movable screen member positionedbelow the plane of the fixed screen for receiving screened materialthrmlghout it.-; length from the fixed screen, links pivotallyconnecting the movable screen member to the side boards, and means foroscillating the lower screen longitudinally.

2. The combination with a convcyer for elevating material, of a shakerscreen therefor, comprising a frame attachable lo the conveyer andhaving members connected to and projecting outwardly therefrom,alongitudinally extending fixed screen connected to some of the membersand projecting out.- wardly therefrom, longitudinally extending: sideboards connected to the fixed screen and some of the frame members, saidside boards being spaced apart a distance greater than the width of thefixed screen, a longiludi' nally extending movable screen memberpositioned below the plane of the fixed screen for receiving screenedmaterial throughout its length from the fixed screen, links pivolallyconnecting the movable screen member to the side boards, a driving meanscarried by the conveyor, connecting rods pivolally connected to theopposite side portions of the movable screen member and to the drivingmeans, and guide members connected to the side boards and extendingbeneath the movable screen member.

In testimony whereof, I afiix my signature.

JESSE B. WHT'INALL.

